Gas leaking from petcock body - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
From the gas tank to the carbs
All fuel system discussion

 
LinkBack Thread Tools Display Modes
post #1 of 5 (permalink) Old 10-28-2005, 11:35 AM Thread Starter
Junior Member
 
Join Date: Oct 2005
Location: Plano, TX
Posts: 25
iTrader: (0)
 
Gas leaking from petcock body

Hi everyone! I've been 'lurking' these forums for several months since getting a used '95. RR relocated and reworked the front brakes thanks to the great posts on this forum
Anyway... I noticed on the way home yesterday that I could smell raw gas when sitting at the lights. Upon inspection, there was gas dribbling (at a rate of about 2-3 drops a second) from the petcock body; it stops when the engine isn't running. I took the tank off and made sure the 4 screws on the back of the petcock were not loose, but that didn't cure the leak. I can't honestly tell exactly where it is coming from... has to be at either of the two elbow connections that go to the carb hoses or is from that little 'vent' hole on the back of the petcock body. The hoses aren't cracked/damaged either.
Just wondering what all could go wrong ... a bad seal in the petcock valve maybe? The front elbow seems to turn easier than expected (which I noticed when taking the tank off); the back one seems quite rigidly attached. Any ideas? And what is that vent-looking hole in the back of the valve body for?
Thanks in advance!
Nausea is offline  
Sponsored Links
Advertisement
 
post #2 of 5 (permalink) Old 10-28-2005, 04:04 PM
Loose Cannon
 
Syrinx's Avatar
 
Join Date: Jun 2004
Location: Rome, GA
Posts: 62
iTrader: (0)
 
Exclamation Re: Gas leaking from petcock body

I recently rebuilt my petcock because I suspected a diaphragm leak causing my sputtering (fuel starvation).
With it only happening while the engine runs, I suspect the seal at the diaphragm. You might only need to replace it and nothing else. However, while you're in there, might as well change out a few o-rings too. There's a chance one of them is to blame.

Here are the P/Ns you'll most likely need (thanks to Ron Ayers's fiche). I can't remember if the diaphragm comes with the new o-ring or not.

Part Number: 43028-1033
Description: DIAPHRAGM
Source: KAWASAKI
Price: $10.03

Part Number: 92055-1085
Description: "0" RING,FUEL TAP LEV (behind the lever)
Source: KAWASAKI
Price: $1.92

Part Number: 670B1504
Description: "O" RING,4MM (behind diaphragm)
Source: KAWASAKI
Price: $1.49

Part Number: 51039-003
Description: "O" RING (only if you remove the petcock from the tank)
Source: KAWASAKI
Price: $2.42

Jaremy aka "Loose Cannon"
former owner of a '94 VN750
Syrinx is offline  
post #3 of 5 (permalink) Old 10-28-2005, 04:08 PM
Loose Cannon
 
Syrinx's Avatar
 
Join Date: Jun 2004
Location: Rome, GA
Posts: 62
iTrader: (0)
 
Re: Gas leaking from petcock body

Quote:
Originally Posted by Nausea
The front elbow seems to turn easier than expected (which I noticed when taking the tank off); the back one seems quite rigidly attached. Any ideas? And what is that vent-looking hole in the back of the valve body for?
Thanks in advance!
Crap - I didn't read your post thoroughly enough!
I don't believe the elbows should move. If that's the case you may need a new petcock. Sometimes you can scoop one up on Ebay but here's Ron Ayers's price:

Part Number: 51023-1392
Description: TAP-ASSY,FUEL
Source: KAWASAKI
Price: $57.41

The vent-looking hole: I was curious about that too - my guess is an actual vent to allow the diaphragm to move.
Good luck to ya.

Jaremy aka "Loose Cannon"
former owner of a '94 VN750
Syrinx is offline  
 
post #4 of 5 (permalink) Old 10-28-2005, 05:28 PM Thread Starter
Junior Member
 
Join Date: Oct 2005
Location: Plano, TX
Posts: 25
iTrader: (0)
 
Re: Gas leaking from petcock body

You're awesome! Thank you for the reply. Considering the price I paid for bike, I really don't mind throwing a few bucks into it now and then.
Nausea is offline  
post #5 of 5 (permalink) Old 10-30-2005, 09:14 PM Thread Starter
Junior Member
 
Join Date: Oct 2005
Location: Plano, TX
Posts: 25
iTrader: (0)
 
Re: Gas leaking from petcock body

Just an update... I hadn't noticed the vent hole in the plastic plate of the diaphram that will drain if the front of the diaphram leaks. On the bright side, the local dealer did have them in stock for $17.
Believe it or not, the elbows on mine will turn and can be removed/reinstalled without leaking. There is a small circular indent in both the elbow and the petcock for where a very thin O-ring could (should?) be installed... there was no O-ring on either one so apparently friction works to seal it just fine.
Thanks again
Nausea is offline  
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

Once registered, your User Name"cannot be changed". We can make exceptions within 7 days, but after that, it is set in stone.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome